diff --git a/src/as/com/threerings/util/ObjectMap.as b/src/as/com/threerings/util/ObjectMap.as
new file mode 100644
index 000000000..b7c477f8d
--- /dev/null
+++ b/src/as/com/threerings/util/ObjectMap.as
@@ -0,0 +1,131 @@
+//
+// $Id$
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2009 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.util {
+
+import com.threerings.util.Map;
+
+import flash.utils.Dictionary;
+
+/**
+ * An implemention of Map that uses a Dictionary internally for storage. Any Object (and null)
+ * may be used as a key with no loss in efficiency.
+ */
+public class ObjectMap
+    implements Map
+{
+    /** @inheritDoc */
+    public function get (key :Object) :*
+    {
+        return _dict[key];
+    }
+
+    /** @inheritDoc */
+    public function put (key :Object, value :Object) :*;
+    {
+        var oldVal :* = _dict[key];
+        _dict[key] = value;
+        if (oldVal === undefined) {
+            size++;
+        }
+
+        return oldVal;
+    }
+
+    /** @inheritDoc */
+    public function remove (key :Object) :*
+    {
+        var oldVal :* = _dict[key];
+        if (oldVal !== undefined) {
+            delete _dict[key];
+            size--;
+        }
+
+        return oldVal;
+    }
+
+    /** @inheritDoc */
+    public function clear () :void
+    {
+        _dict = new Dictionary();
+        _size = 0;
+    }
+
+    /** @inheritDoc */
+    public function containsKey (key :Object) :Boolean
+    {
+        return (get(key) !== undefined);
+    }
+
+    /** @inheritDoc */
+    public function size () :int
+    {
+        return _size;
+    }
+
+    /** @inheritDoc */
+    public function isEmpty () :Boolean
+    {
+        return (_size == 0);
+    }
+
+    /** @inheritDoc */
+    public function keys () :Array
+    {
+        var keys :Array = [];
+        forEach0(function (k :*, v :*) :void {
+            keys.push(k);
+        });
+        return keys;
+    }
+
+    /** @inheritDoc */
+    public function values () :Array
+    {
+        var vals :Array = [];
+        forEach0(function (k :*, v :*) :void {
+            vals.push(v);
+        });
+        return vals;
+    }
+
+    /** @inheritDoc */
+    public function forEach (fn :Function) :void
+    {
+        forEach0(fn);
+    }
+
+    /**
+     * Internal forEach.
+     * @private
+     */
+    protected function forEach0 (fn :Function) :void
+    {
+        for (var key :Object in _dict) {
+            fn(key, _dict[key]);
+        }
+    }
+
+    protected var _dict :Dictionary = new Dictionary();
+    protected var _size :int = 0;
+}
+
+}